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Originally Posted by CyberTroniX
something else about RTS and CTS ... fowlerm posted : " The other pins on the Vex's serial port are control lines RTS and CTS "
so if pin 4 and pin 6 are not rts and cts , then what are they ? and where should i connect the rts and cts of my module ?
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That was my initial thought, I now know that the following pinout is correct:
1 - RJ3 on the master uP
2 - +5v
3 - RB0 the master uP
4 - Gnd
5 - Rx for UART 1 on the user uP
6 - Tx for UART 1 on the user uP
The numbers correspond to the numbers printed on the Vex Controller's PCB.
As far as RTS and CTS for your module, they are only used for hardware flow control. If you don't want hardware flow control I believe you can simply connect the RTS pin to the CTS pin to have the module operate without flow control. I know this is true for the module Kevin Watson posted.